A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

Mr Hartcher says a report by the Australian Energy Market Operator (AEMO), released on Friday, supports the government's view that future gas availability is inadequate without new local supply by 2017.

He says the AEMO report suggests restrictions on usage may have to be imposed.

"Over 1.2 million households in NSW rely on gas for their heating and cooking needs and could be affected by shortages when existing sources from South Australia are diverted to meet export commitments and if proposed projects in NSW don't get off the ground," Mr Hartcher said in statement.

He said the 2013 Gas Statement of Opportunities report outlines the shortfall in NSW by 2018 would be up to 200 terajoules a day over a seven-month period.

"That equals half the average daily demand for gas in NSW, or around one third of demand on a peak winter day - potentially affecting around half a million households across the state.

"It would particularly impact upon our manufacturing industries, many of which are already struggling to meet their energy needs in a competitive environment.

At the time he said of all the projects he'd approved, he was unsure if they would go ahead because of "substantial issues".

NSW Conservation Council spokeswoman Kate Smolski says drilling for gas in NSW will not alleviate prices.

"A recent The Australia Institute report shows that the gas that is produced here will be exported through the LNG plant coming online in Gladstone, Queensland," Ms Smolski told AAP.

"The community of Gloucester and special wild places like the Pilliga forest deserve to be protected from polluting coal seam gas. The industry will export NSW gas to the Asian market for a higher price and leave the damage here.

"Our groundwater, community health and special wild places are too precious to be risked for short-term industry profit."

The Wilderness Society has also accused the state government of putting Australia's groundwater at risk as it "toes the Santos and AGL line".

Greens NSW mining spokesman Jeremy Buckingham called on government and industry to discuss domestic gas reservation as a sensible regulatory response following the AEMO report.

"The rush to export huge amounts of LNG is severely distorting the East Coast gas market and the only sensible response is for the government to regulate the industry to ensure domestic supply to households and the manufacturing industry," he said in a statement.

"The AEMO report notes that domestic demand for gas will only increase by 0.9 per cent per annum and it is LNG exports that are causing an artificial gas crisis."

Mr Buckingham said Mr Hartcher should "stop bleating" about coal seam gas and talk with his state and federal colleagues about reserving conventional gas for domestic needs to avoid a looming market failure.

"Why should the LNG gas consortiums be able to prioritise exports to North Asia over the gas requirements of Australian businesses and households?"